x^2-4x-11=30

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Solution for x^2-4x-11=30 equation:


Simplifying
x2 + -4x + -11 = 30

Reorder the terms:
-11 + -4x + x2 = 30

Solving
-11 + -4x + x2 = 30

Solving for variable 'x'.

Reorder the terms:
-11 + -30 + -4x + x2 = 30 + -30

Combine like terms: -11 + -30 = -41
-41 + -4x + x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-41 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + -4x + 41 + x2 = 0 + 41

Reorder the terms:
-41 + 41 + -4x + x2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + -4x + x2 = 0 + 41
-4x + x2 = 0 + 41

Combine like terms: 0 + 41 = 41
-4x + x2 = 41

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 41 + 4

Reorder the terms:
4 + -4x + x2 = 41 + 4

Combine like terms: 41 + 4 = 45
4 + -4x + x2 = 45

Factor a perfect square on the left side:
(x + -2)(x + -2) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(x + -2) equal to 6.708203933 and -6.708203933.

Subproblem 1

x + -2 = 6.708203933 Simplifying x + -2 = 6.708203933 Reorder the terms: -2 + x = 6.708203933 Solving -2 + x = 6.708203933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 6.708203933 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6.708203933 + 2 x = 6.708203933 + 2 Combine like terms: 6.708203933 + 2 = 8.708203933 x = 8.708203933 Simplifying x = 8.708203933

Subproblem 2

x + -2 = -6.708203933 Simplifying x + -2 = -6.708203933 Reorder the terms: -2 + x = -6.708203933 Solving -2 + x = -6.708203933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -6.708203933 + 2 Combine like terms: -2 + 2 = 0 0 + x = -6.708203933 + 2 x = -6.708203933 + 2 Combine like terms: -6.708203933 + 2 = -4.708203933 x = -4.708203933 Simplifying x = -4.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.708203933, -4.708203933}

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